Harrow-tooth.



no.' 690,776." Patented lan. |902.

1A, H. s cHAfFER. HARROW TOOTH.

, mpplicmon mlApr. 30.1901.;

tuo maar.)

l UNITED` STATES PATENT OFFICE.

AUGUSTUS II. SCHAFFEl-OF ONTONAGON, MICHIGAN. A

HARROW-TOOTH.

SPECIFICATION forming part of Letters Patent No. 690,776, dated January 7, 1902.

Application filed April 30, 1901.

T a/ZZ whom, it may concern:

Beit known thatLAUGUsrUs H. SCHAFFER, a citizen of the United States, and aresident of Ontonagon, in the county of Ontonagon and State of Michigan, have invented a new and useful Improvement in Harrow-Teeth, of which the following is a full, clear, and exact description.

, The invention consists in the novel construction and combination of theseveral parts, as

' will be hereinafter fully set forth,and pointed out in the claim.

Reference is to behad to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the iigures.

Figure 1 is a perspective View of a harrow having the improved teeth applied. Fig. 2 is a side elevation of one of the barrow-teeth and a portion of the barrow-frame to which the tooth is attached, and Fig. 3 is a section taken practically on the line 3 3 of Fig. 1.

A represents a harrow-frame,which may be of any desired construction. As shown, the frame'consists of a rear bar 10 and a front bar A11 and an equal number of connecting-bars 12 at each side .of the center of the frame. At the front portion of the harrow-frame A a draft device A of any suitable character is attached.'

n The barrow-teeth B extend vertically from the aperture inthe. tooth below the iiange 14 and Serial No. 58,118. (Nomodel.)

through a suitable aperture in a connectingbar 12. This bolt is provided witha nut and washer and not only serves to secure the tooth to the connecting-bar of the frame, but also serves to strengthen the frame, and the teeth may be secured to the bars of a harrowframey of very light construction. The face bof a tooth B, at which the flange 14 is located, is more or less longitudinally convexed and the'opposite side face b' is more or less longitudinally concaved. The front edge Zr of the tooth is made sharp from a point near the top to the bottom, and this cutting edge is convexed, while the rear edge of the tooth is more or less concaved. The tooth is made to taper, being narrowest at its lowest end, and the cutting edge b2 extends along the bottom of the tooth to the back. v y

The vteeth are made right and left, and preferably in applying these teeth to a frame the teeth on one half of the number of connection-` bars are placed the reverse of the other half, the arrangement being from the'center, and it will be observed that these teeth cut through the ground and do not clog, but make practically sharp furrows in the ground, and after-a harrow provided with the improved teeth has been passed over a iield the surface of the ground lwill be thoroughly sliced and pulverized, but will be in a smooth condition and level.

Having thus described my invention, I

claim as new and desire tosecure by Letters vPatent- A harrow-tooth constructed of flat springsteel, the said tooth being longitudinally tapered and provided with aflange at its upper edge exten-ding at right angles from the body, and also provided centrally with a bolt-hole parallel with said iiange and midway between the edges thereof, one side faceof the tooth' being convexed and the opposing side face concaved, the forward edge of the tooth being the cutting edge and longitudinally convexed, the cutting edge extending to the rear edge of the tooth at the bottom, which rear edge is longitudinally concaved,as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

AUGUSTUS H. SCHAFFER.

Witnesses:

A. E. SHUSTER, J. H. HAIGfHtr. A

IOO 

